Coil spring treating machine



Sept. 14, 1954 B. E. MEYER COIL SPRING TREATING MACHINE Filed April 17, 1953 VEN TOR.

Patented Sept. 14, 1954 UNITED STATES PATENT OFFICE COIL SPRING TREATING MACHINE Bruno E. Meyer, San Antonio, Tex.

Application April 17, 1953, Serial'No. 349,338

6 Claims.

The invention relates to coil spring treating machines particularly in regard to the treatment of automotive coil springs.

Automotive coil springs become shorter after a period of use, however, the metal itself deteriorates very little.

An object of the present invention is to elongate the coil spring to its original length and to restore the steel to its original qualities or better.

Another object is to restore coil springs to their original size and quality by peening or hammering while the coil spring is in a stretched condition.

Other objects and advantages will become more readily apparent after a study of the drawing and following specification.

In the drawing:

Fig. 1 is a side elevation of a motor-driven embodiment of the present invention.

Fig. 2 is a side elevation of a more simple form of the device.

Referring now to the drawing in detail wherein like parts are correspondingly numbered, a round bar 3 is provided with a hole to receive pin 4. Coil spring is shown in position on bar 3. Bar 3 is rovided with a short extension 5 of reduced diameter. Hydraulic jack 1 is provided with opening 8 of reduced diameter to receive short extension 6. Strap 9 is positioned around hydraulic jack 1 and is provided with adjusting screw Ill.

Supporting timbers II are provided to retain round bar 3 in horizontal position. In Fig. 1, a motor 12 turns pulley I3 which in turn rotates larger pulley M by means of belt l5. Pulley I4 is mounted on round bar 3. Powered peening tool it operated by handle I! movably attached by means of bracket I8 positioned on one timber ll. Line I 9 may be air hose or electric wire.

In use, with the simple device shown in Fig. 2, the coil spring 5 is placed around bar 3 which is of the required diameter. Pin 4 is inserted into complementary hole provided in bar 3. Jack 'I is positioned on bar 3 by means of opening 8 which fits around short extension 6 of bar 3, thereby retainin jack I in position. Pin 4 retains coil spring 5 in position around bar 3 at one extremity of spring 5. Strap 9 retains coil spring in position at the other extremity thereof. The coil spring 5 may thereby be positioned around bar 3 and stretched the desired amount by adjustment of the jack 1 through strap 9. The entire device is turned and peened or hammered by an operator standing between the timbers ll. Every inch of the coil spring 5 should be treated while under strain. In the device shown in Fig. 1, the bar 3 is to be rotated by means of motor l2 through 2 pulley l 3 and belt I5. A pulley of larger diameter than pulley l 3 is positioned on bar 3 and the bar 3 is thereby rotated on bearings I6 positioned on timbers II. A powered peener or hammer I6 is movably positioned on one timber I I and operated by handle ll. As bar 3 with coil spring 5 is rotated, the powered peening tool provides repeated blows on stretched coil spring 5 thereby providing the desired peening treatment. The powered peening tool l6 may be operated by air or electricity or the like. To remove the coil spring 5 release jack 1, take ofi strap 9, push out pin 4 and the coil sprin 5 may be readily removed from bar 3.

By peening every inch of the coil spring while under strain, all parts of the spring are equally elongated and the characteristics of the metal improved. Different size bars are required for various sized coil springs.

It should be understood that the device shown is for purposes of illustration only and not limitation as other forms of the device will be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the appended claims.

I claim:

1. In a device for treating coil springs, a bar provided with a hole drilled at right angles to its long axis and provided with a projecting extremity of reduced diameter, a jack adapted to be positioned on said projecting extremity of said bar, a strap positioned around said jack and adapted to retain one extremity of a coil spring in stretched condition, said strap provided with adjustment means, and a pin inserted into said hole in said bar to retain the other extremity of said coil spring in stretched condition.

2. In a device for treating coil springs, a bar of circular cross-section provided with an integrally formed projecting extension at one extremity thereof, a jack provided with a projection adapted to fit said integrally formed projecting extension of said bar, a strap positioned around said jack, the ends thereof projecting on either side of said bar, said strap adapted to retain one extremity of a coil spring being treated, said bar provided with a hole drilled intermediate of its length to receive a pin, said pin retaining the other extremity of said coil spring being treated.

3. In a device for treating coil springs, a round bar provided with a projecting extension of reduced cross-section at one extremity thereof, a jack provided with a projection adapted to fit said projecting extension of reduced cross-section, a strap of U-shape adapted to be positioned around said jack, the ends thereof projecting on either side of said round bar, said strap adapted to retain one extremity of a coil spring being treated, said round bar provided with a hole drilled intermediate of its length to receive a pin, said pin acting to retain said coi1 spring being treated in stretched condition around said round bar.

4. The device as recited in claim 3 wherein motor driven means are provided to rotate said round bar about its longitudinal axis.

5. The device as recited in claim 4 wherein a power peening device is positioned above said round bar to provide the treating means while said round bar is being rotated by said motor driven means.

6. A device for treating coil springs comprising a round bar of a diameter substantially equal to the internal diameter of said coil spring, said round bar provided with an integral projection at one extremity thereof, a jack provided with a sleeve to receive said integral projection of said round bar, a strap positioned around said jack, the extremities thereof being adapted to retain one extremity of said coi1 spring, said round bar being provided with a removable pin to retain the other extremity of said coil spring in position around said round bar.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,731,763 Chaney Oct. 15, 1929 1,844,309 Batz Feb. 9, 1932 1,986,426 De Bats Jan. 1, 1935 2,161,227 Houston June 6, 1939 2,249,677 Wallace July 15, 1941 2,252,036 Rummer Aug. 12, 1941 

